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store.go
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store.go
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package redis_session
import (
"encoding/base32"
"errors"
"github.com/go-redis/redis"
"github.com/golyu/redis-session/serializer"
"github.com/gorilla/securecookie"
"github.com/gorilla/sessions"
"net/http"
"strings"
"time"
)
// RedisStore stores sessions in a redis backend.
type RedisStore struct {
Pool *redis.Client
Codecs []securecookie.Codec
Options *sessions.Options // default configuration
keyPrefix string // key前缀
maxLength int // 数据最大长度
serializer serializer.ISessionSerializer
}
var (
defaultSessionOptions = &sessions.Options{
Path: "/",
Domain: "",
MaxAge: 86400 * 7, // session expire time ,second
Secure: false,
HttpOnly: true,
SameSite: http.SameSiteDefaultMode,
}
)
// NewRedisStore instantiates a RedisStore with a *redis.Client passed in.
func NewRedisStore(pool *redis.Client, keyPairs ...[]byte) *RedisStore {
rs := &RedisStore{
Pool: pool,
Codecs: securecookie.CodecsFromPairs(keyPairs...),
Options: defaultSessionOptions,
maxLength: 4096,
keyPrefix: "session_", // session key prefix in redis
serializer: serializer.GobSerializer{},
}
return rs
}
func (s *RedisStore) Close() error {
return s.Pool.Close()
}
//SetExpireSecond 设置过期秒数
func (s *RedisStore) SetExpireSecond(expire int) *RedisStore {
if expire >= 0 {
s.Options.MaxAge = expire
}
return s
}
//SetMaxLength 设置session内容最大限制
func (s *RedisStore) SetMaxLength(l int) *RedisStore {
if l >= 0 {
s.maxLength = l
}
return s
}
// SetSerializer sets the serializer
func (s *RedisStore) SetSerializer(ss serializer.ISessionSerializer) *RedisStore {
s.serializer = ss
return s
}
// Get returns a session for the given name after adding it to the registry.
// See gorilla/sessions FilesystemStore.Get().
func (s *RedisStore) Get(r *http.Request, name string) (*sessions.Session, error) {
return sessions.GetRegistry(r).Get(s, name)
}
// New returns a session for the given name without adding it to the registry.
// see gorilla/sessions FilesystemStore.New().
func (s *RedisStore) New(r *http.Request, name string) (*sessions.Session, error) {
var (
err error
ok bool
)
session := sessions.NewSession(s, name)
options := *s.Options
session.Options = &options
session.IsNew = true
if c, errNoCookie := r.Cookie(name); errNoCookie == nil {
// decode function see: github.com/gorilla/securecookie Decode(). 303 row
err = securecookie.DecodeMulti(name, c.Value, &session.ID, s.Codecs...)
if err == nil {
ok, err = s.load(session)
if err == nil && ok {
session.IsNew = false
}
}
}
return session, err
}
//Save Save the sess information to redis, if the request does not exist, generate a new session
func (s *RedisStore) Save(r *http.Request, w http.ResponseWriter, session *sessions.Session) error {
if session.Options.MaxAge <= 0 {
if err := s.delete(session); err != nil {
return err
}
http.SetCookie(w, sessions.NewCookie(session.Name(), "", session.Options))
return nil
}
if session.ID == "" {
session.ID = strings.TrimRight(base32.StdEncoding.EncodeToString(securecookie.GenerateRandomKey(32)), "=")
}
if err := s.save(session); err != nil {
return err
}
encoded, err := securecookie.EncodeMulti(session.Name(), session.ID, s.Codecs...)
if err != nil {
return err
}
http.SetCookie(w, sessions.NewCookie(session.Name(), encoded, session.Options))
return nil
}
//load read the session from redis.
func (s *RedisStore) load(session *sessions.Session) (bool, error) {
data, err := s.Pool.Get(s.keyPrefix + session.ID).Result()
if err != nil {
return false, err
}
if data == "" {
return false, nil
}
return true, s.serializer.DeSerialize([]byte(data), session)
}
//save stores the session in redis.
func (s *RedisStore) save(session *sessions.Session) error {
bs, err := s.serializer.Serialize(session)
if err != nil {
return err
}
if s.maxLength != 0 && len(bs) > s.maxLength {
return errors.New("the value to store is too big")
}
age := session.Options.MaxAge
if age == 0 {
age = s.Options.MaxAge
}
return s.Pool.Set(s.keyPrefix+session.ID, bs, time.Duration(age)*time.Second).Err()
}
// delete removes keys from redis
func (s *RedisStore) delete(session *sessions.Session) error {
return s.Pool.Del(s.keyPrefix + session.ID).Err()
}